The sad thing is this happens more than we know-Not everyone loves and respects animals the way we do- There is nothing you can do about it.
I think it is a good thing the puppies were euthanized, I am sure if they weren't they would be have been thrown in the shelter bc nobody would want to adopt them, then they would have put them to sleep anyways because of the deformities.
If it were me, I would stay clear away of that house and those people, I would not put myself in that position to see that again.